Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!cheetah.nyser.net!mrose
From: mrose@cheetah.nyser.net (Marshall Rose)
Newsgroups: comp.protocols.iso
Subject: Re: CONS / CLNS interworking
Message-ID: <8437.611538221@cheetah.nyser.net>
Date: 18 May 89 23:43:41 GMT
References: <2680@osiris.sics.se>
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: iso@sri-nic.ARPA
Organization: The Internet
Lines: 19

In February of last year the Wollongong Group built a transport service
bridge which allows OSI applications to interwork between CO-mode and CL-mode
networks.  For example, you can have a FTAM running on a host with TP4 / CLNP
talk to an FTAM running on another host with TP0 / X.25.  This is also
used for bridging into TCP/IP-based internets, i.e., RFC1006 / TCP.  The
key aspect of this approach is that it requires only a very modest change
to the initiator to "know" about the bridge, and no changes to the responder.
In terms of protocol changes, there are none.

I know of at least three implementations of the TS bridge now (the others
are in France and the UK), and it is generally viewed as a terrible idea
(being level-4 relay) yet is quite successful since no other solution works,
period.

I'd like to take credit for inventing the TS bridge, but Steve Kille of
University College London and Christian Huitema of INRIA proposed such a
box back in November of 1987.  I was the first to implement it though...

/mtr